> On 09/22/2016 01:48 PM, Jan Hubicka wrote: > > > > * postreload.c (reload_cse_simplify): Also accept USE in noop move > > patterns. > > > >diff --git a/gcc/postreload.c b/gcc/postreload.c > >index 61c1ce8..4f3a526 100644 > >--- a/gcc/postreload.c > >+++ b/gcc/postreload.c > >@@ -153,7 +153,8 @@ reload_cse_simplify (rtx_insn *insn, rtx testreg) > > value = SET_DEST (part); > > } > > } > >- else if (GET_CODE (part) != CLOBBER) > >+ else if (GET_CODE (part) != CLOBBER > >+ && GET_CODE (part) != USE) > > break; > > } > > Hmm. This is probably ok, but what's the USE for in your pattern?
Becuase moves in vector unit at GCN require exec reigster to be set to -1 and this is modelled by explicit use. Honza > > > Bernd
